Display Internal Antenna Coil Layout for Lower Ohmic Loss
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Solution Overview
Problem
Internal antennas in displays face challenges with high ohmic loss due to heat and limitations in increasing thickness, which affect their performance in 5G communication systems, particularly in the mmWave band.
Innovation Solution
A power supply device with a multi-layer coil structure is implemented, where coils are connected in parallel to reduce resistance and increase inductance, allowing for efficient current supply and maximizing the Q value, thereby enhancing antenna performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of the transparent electrode is increased to reduce ohmic loss, then the resistance decreases, but the thickness cannot be continuously increased due to semiconductor process limitations
Solution Approach 1:
The patent transitions from a single-layer transparent electrode structure to a multi-layer coil structure with vertical stacking. By adding the dimension of layer stacking, the system achieves increased effective conductor cross-section without increasing the planar thickness beyond semiconductor process limits, thereby reducing ohmic loss while maintaining manufacturability.
Solution Approach 2:
The patent employs a composite structure combining multiple transparent electrode layers formed in different semiconductor process steps. Each layer contributes to the overall conductivity, and the composite structure achieves superior electrical performance compared to a single thick layer, overcoming the thickness limitation imposed by semiconductor manufacturing processes.
2Device complexity
If a single-layer coil structure is used, then the structure is simple, but the Q value is limited due to higher resistance
Solution Approach 1:
The patent divides the single coil structure into multiple segments or layers, where each layer contributes to the overall inductance. This segmentation allows for reduced resistance through increased effective conductor area while maintaining the functional requirements of the antenna, thereby improving the Q value without excessive complexity.
Solution Approach 2:
The patent merges multiple transparent electrode layers into a unified multi-layer coil structure. By combining the conductive paths of multiple layers in parallel, the overall resistance is reduced while the inductance is maintained or enhanced, achieving a higher Q value despite increased structural complexity.
3Reliability
If parallel coil connection is implemented to reduce resistance, then the Q value increases, but the power supply complexity increases
Solution Approach 1:
The patent merges the power supply connections for multiple coil layers by connecting corresponding terminals together. This approach achieves parallel connection of the coils to reduce resistance and increase Q value, while minimizing power supply complexity by using a unified connection scheme rather than separate independent power supply paths for each layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces resistance and increases inductance, leading to improved antenna performance by maximizing the Q value, which is essential for efficient data transmission in 5G communication systems, especially in the mmWave band.
Implementation Method 1
A current flowing through the coil conductor induces a current in the planar conductor, this current produces a magnetic flux in a direction normal to the planar conductor
Data Source
Figure 1~3
Figure 4~6
Figure 7~9b
AI summary
A power supply device for an internal antenna of a display is provided. The power supply device includes at least two coils configured to be separated by a predetermined interval and a power supply terminal of the at least two coils to connect the at least two coils in parallel. An integrated circuit (IC) includes the power supply terminal of the at least two coils connects the at least two coils in parallel and supplies a current to the at least two coils through the included power supply terminal. Phases of the current flowing in the at least two coils are the same due to the current supplied by the IC.